Motor-controller.



E. TOBIESSEN.

MOTOR CONTROLLER.

APPLICATION FILED JULY 24.1915.

1,279,790. PatentedSept. 24,1918.

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' the il} til ZATEZE PATENT Gi l? T whines-m or wees ALL s, Wisconsin",.ASSIGNOR, TO ALLIS-QHAL1VLEIRS 3 TUEIEG fiQMPANY, F MILW'AUKEIE,WISCQNSIN, A OORPQR-ATEQET 01? in. operating induction motors 01"? thewound secondary type, it is highly desii able in order to protect thewindings against the of dangerously heavy cmrrents (lining the starting;of'the motor, that means he provided for preventing the closure of theprimary circuit unless a consideieble {LDllOllXl'iJ of resistance isincluded in secondary circuit.

it is an chjiect of this invention. to provide an in'iproved controldevice for induction motors comprising co'ciperntive primary andsecondary centiolelements that accomplish the desired conti'bl and, atthe same time, serve to fully protcct'the motor.

a Eurthei' object of this invention to PM. ide improved control.apparatus of this chzfncter cfiective to insure that the prime controlelement can be operated. to clot position cnly when the scccndery ccniolelement is in. proper position. to opeiuticn motor during the 1;;period. u

and other cbgects ere nth invention, the various novel features oilwhich will s opes the dc tion mid dinwings, disclosing cue embodiments'a im ntion, and will be pasticuleily l out in the claims.

as onipzinying; drawings:

1. is s psiifticlly diegi'ennnctic indi'sction inotoi: and control eptheprimarycontrol elethe act i' ting devices the prii. secondary controlelements being ,cf 1. 1,9,2 3 is 2, partial elevat on of the ep-MOTOR-CONTRQLLER.

many and secondary circuits of induc-x F ed by Specification. of LettersPstent. Patgnfiegi Sgpt, 24, 1918,

iipplicsticn filed 5 12.2. fi l, Serial No. 42,103;

psietus of Fl x 1, looking from the front side of the panel.

In accordance with the illustrated disclosure, an induction motor M,here shove us being of the three-phase type, is suy- 13 and 142 beingoperative, in their movement in an anti-clockwise direction across thesegments 16, 17 and 18, respectively, to short-circuit sections of theresistance elements :21, 22 and 23, respectively, The supporting elementcarrying the Contact arms 1'24, 13 and 14 is shown mounted. on anoperating rod 24 which passes through c control panel P, a suitablebearing for the rod being provided in the panel, and an operating handle25 for the-rod being provided on the front side of the panel, the,handle being provided with a latch 26 enga-genble with a series ofratchet stops on member 27 suitably mounted on the front side of thepanel. The OOnlJJOllGF C is shown in. a. position i'en'ioved by onesegment from initmi oi? resistance-in pcsition, that is, the pc: tionnormal Ly occupied by the controller when the motor is at rest, amaximum;

amount of resistance being included in the circuit oi? the secondaryWinding of the motor at this time.

The primary controlling switch S prefen ably comprises contzuztssuitably mountedin a receptacle and immersed in oil therein, the fixedcontacts 31 being arranged in pairs, one contact of each pair beingconnected to one side oii'th'e circuit a, (3, c, and the other contactofeach pair being connected to one oi the terminals of the primary windingof the motor M, and movable contacts 32 being in the form of bridgingelements edapted to connect the several pairsoif fixed contacts 31 tothereby establish a connection between the primary its through a rod orcircuit of the motor and the supply circuit a, Z), 0. The movablebridging elements 32 are suitably connected for simultaneous operationby a reciprocatin actuating rod 34 which enters the receptac e in whichthe contacts are mounted, this receptacle being shown mounted on a fixedsupport, preferably in the form of two parallel castings or plates 36and 37 disposed at right angles to the panel P and secured thereto atthe rear side thereof.

The rod 34-,is actuated by an arm 38 pivotally secured to the plates 36and 37 as pin 39 pivotally mounted in these plates. The arm 38 isactuated by a rod 41 which passes through the panel P to the front sidethereof, being there connected to an operating arm 42 pivotally mountedon a fixed support 43 secured on the front side of the panel, theconnection between the rod 41 and the arm 38 being through a toggle 45comprising links 46 and 47, the for-- mer being pivotally connected tothe arm 38 and the latter being pivotally connected to a fixed point, ason an extension of an element 48 secured to the plates 36 and 37, therod 41 being pivotally connected to the knee of the toggle. The fullline position of the actuating mechanism for the primary switch, in Fig.1, indicates switch-open condition. The switch is closed by actuation ofthe operating arm 42 in an anti-clockwise direction, this actuationreciprocating the rod 41 to straighten out the toggle 45 and move theoperating arm 38 in a clockwise direction to thus reciprocate the rod 34which operates the bridging elements 32 to switch-closed position. WViththe switch in closed position, the actuating mechanism therefor occupiesthe position indicated in dotted lines inFig. 1, the axis of the knee ofthe toggle 45 occupying a position slightly in such position that beyondthe center line of the pivotal points 1 of connection of the link 46 tothe 'arm 38 and the link 47 to the element 48, the parts being thus heldsecurely against accidental operation tending to open the switch.

Mounted on the rod 24 which serves to actuate the controller 0 andimmediately adjacent the rear side of the panel P is an arm 51 securelyfixedto the rod and provided at its outer end with a cam portion 52terminating in a squared end portion 53. A rod 54 is slidably mounted inguides 56 and. 57 secured to the rear side of the panel P, the rod beingmovable into the path of movement of the outer end of the arm 51.Secured to the rod 54 is a saddle or cross-head 58, this element beingloosely connected to a fixdpoint, as one or both of theisiipportingtoggle 61 comprising pivotally connected g5.- the latter pairs of arms62' pivotally connected to the element 58 and pivotally connected to theplates 36 and 37, through a.

and 63, the former being.

plates 36 and 37, as through a pin or rod 64 pivotally mounted in theplates 36 and 37, and the links being pivotally connected together asthrough a pin or rod 65. The arm 38 is provided with a pin 67 extendingfrom opposite sides thereof and engageable in recesses 68 in the links63, between which links the operating arm 38 extends. The toggle 61 isheld in such position that the pin 67 is retained in recesses 68 bymeans of a spring 71 secured at one end to the pin 39 and at the otherend to the pin 65, With the pin 67 held in the recesses 68, it will beapparent that the arm 38 is prevented from movement in a clockwisedirection, that is, such movement as causes closing of the switch. Itwill be biasing spring '11, the upper end of the rod 54 is resilientlyurged into the path of the arm 51.

The toggle, as far as its effect is concerned, may be regarded asessentially the link 62 constrained at one end by any mem; ber, hereshown as link 63, to move at said end substantially transversely to itslength; or it may be considered essentially the link 63 which swingsabout pivot 64 thus the other pivot-end 65, this motion beingtransmitted in any manner to the rod 54 to be raised, as by-link 62. Inthe construction illustrated the effects of the two links 62, 63 are, ofcourse, addedj One of the advantages of a construction producing atoggle efl'ect, either double or single, is that friction in the guides56 is more certainly overcome and a smaller spring 71 may be used.

Vhenthe controller C is in initial or resistance-in position, that is,with the arms 12, 13 and 14 on the first of the segments 16, 17 and 18,respectively, the element 51 is the upper end of the rod 54 is 1nengagement with the squared end portion 53, at which time the rod isurged by the element 51 to a position wherein the toggle 61 is shiftedtoward collapsed position, this position being indicated in dotted linesin Fig. 1. lVith the'parts in this position, it will-be apparent'thatthe links 63 are so positioned that the pin 67 is free of the recesses68 in such links. With the toggle in this latter position, it will beapparent that there is nothing to prevent apparent also that through thetoggle 61 and its raising such actuation of the arm 38'as causes oper- Sto closed position.

been closed, the coni While thecontroller C is in other than initial orfull resistance-in position, will cause the engagement of the pin 67 inthe recesses -68 to prevent subsequent closure of the switch formotorstarting purposes, until. the con" troller G has been actuated toinitial or full resists nee-in position, at which time the links 63 aremoved out of l tching engagement with the pin 67, through the engagementoi the cam portion 52 of the element 51 with the upper end of tee rodbi,

It i/Vlll be apparent that the closure of the primary switch Scanbeeffected only when ,the resistance of the secondary circuit Lisamaximum, the controller (3, when in other than full resistance-inposition, acting through the interlock to prevent the starting of themotor except under proper operating conditions; and that, in accordanceWith this invention, the primary and secondary control elements are sointerlocked as to permit desirable operation and to prevent anyundesirable operation thereof in controlling the motor. 7

The term toggle is used in the claims for the sake of brevity and isintended to deiine any device producing a toggle effect finch an effectmay be secured by a link operatiyely related to other members and soconstrained that the application to said link of a relatively smallforce in a predetermined 'on "will result in the production of a iclatiin large force in a direction transverse to the first named direction.

it should be understood thatit isnot desired Lat this invention, asclaimed, be limited "to the exact details of construction dire/cSl'lOWi'i and'dcscribed, for obvious modifications will occur to aperson slnlledin the I in a system. ior controlling alternating" itinduction inotors of the type having primary and secondary windings, acontrolling switch adapted to be connected in the circuit the pi iinaryWinding, actuating means for said switch, controller adapted the circuitof the secmeans comprising a togicntl urged a iosition wherein an 5hcleznci the eof to poi-a with a part sociatcd ul n the actuating means.i'or said actuating said switch, a controller adapted to be associatedwith the cii cuit of the secondary Winding, said controller be ngoperatlve to insert resistance in andreniove sistance from the circuitoi said secondary Winding, interlocking means between said switch andsaid controller comprising a toggle and an element associated With theactuating means for said primary switch, a I

against closure and operable by said controller through saidvcam elementand said rod to release said sivitch'and permit closure thereof.

3. Inc system for. controlling alternating current induction motors ofthe type having primary and secondary windings, a, controlling switchadapted tobe connected in the circuit of said primary windings, acontroller operable to insert resistance in or to remove resistance fromthe circuit of said secondary winding, a panel, actuating means for saidprimary switch and said secondary controller comprising parts mounted onthe front side of said panel, latch means disposed at the rear oi saidpanel and com prising a toggle including; a recessed link cooperativewith an element associated with the actuating means for said primaryswitch, said toggle being biased to position wherein it holds saidprimary switch against closure,

a rod for actuating said toggle slidably mounted at the rear of saidpanel, and a earn element operable by said secondary 3ontrollcr to'causesuch actuation of said rod as causes said toggle to movie to a position,

wherein closure of said primary switch is permitted.

in combination, a controlling" device, a switch, actuating mechanism forsaid controlling device and said switch, and an ,in- "bllOClt' betweensaid controlling device and. aid switch, said interlock comprising atogle including a recessed link cotipcrativ ith an element associatedwith the actuating mechanism for said switch and biased to positionwherein said switch is held a ainst closure, a rod for actuating saidtog gie and cam element actuatahle by said controlling device when in acertan position for actuating said. rod to cause operation ot saidtoggle to .a position wherein closure of said switch permitted,

5. in a controlling apparatus for electric n'iotors, a controllingswitch adapted to be connected in a circuit of the motor, actuatingmeans for said switch, a controller operative to insert resistance inand remove resistance from a circuit of said motor, and latch meanscomprising a toggle resiliently urged to a powon herein an elementthereof n is with a part associated controller comprising a toggle andan element associated with the actuating means for said switch, a rodfor actuating said toggle, and a cam element operable by said controllerfor actuating said rod, said toggle being effective to-hold said switchagainst closure and operable by said controller through said cam elementand said rod to release saidswitch and permit closure thereof.

7. In a controlling apparatus, a switch, a resistance-varyingcontroller, a panel, actuating means for said switch and said controllercomprising parts mounted on the front side of said panel, latch meansdisposed at the rear of said panel and "comprising a toggle including arecessed link cooperative with an element associated with the actuatingmeans of said switclr said toggle being biased to a position wherein itholds said switch against closure, a rod for actuating said toggle andslidably mounted at the rear of said panel, and a cam element operableby said controller to cause such actuation of said rod as causes saidtoggle to move to a position wherein closure of said switch ispermitted.

8. In a controlling apparatus, the combination of a switch, means foractuating said switch and biased to a position wherein it looks saidswitch against actuation, and an operative connection between saidtoggle and the actuating means for said controller, said operativeconnection comprising a reciprocating rod guided in its movement andmechanically associated with said toggle and actuatable by the actuatingmeans for said controller.

9. In a controlling apparatus, a switch, a controller, a panel, saidswitch and said controller being located at the rear of said panel,actuating means for said switch and said controller comprisingmanipulable parts mounted on the front side of said panel, and operatingparts passing through said panel and connected with said switch andcontroller respectively, means for locking said switch against actuationto one of its operative positions except when said controller is in acertain position, said locking means comprising a locking toggle biasedto a position wherein it effectively prevents actuation of said switch,and an operative connection between said toggle and the actuating meansfor said controller, said operative connection comprising areciprocating rod guided in its movement and said locking means and saidoperative connection being mounted at the rear of said panel.

In testimony whereof, the signature of the inventor is affixed hereto.

EMANUEL. TOBIESSEN

